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Ameen M, Zafar A, Mahmood A, Zia MA, Kamran K, Javaid MM, Yasin M, Khan BA. Melatonin as a master regulatory hormone for genetic responses to biotic and abiotic stresses in model plant Arabidopsis thaliana: a comprehensive review. FUNCTIONAL PLANT BIOLOGY : FPB 2024; 51:FP23248. [PMID: 38310885 DOI: 10.1071/fp23248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/09/2024] [Indexed: 02/06/2024]
Abstract
Melatonin is a naturally occurring biologically active amine produced by plants, animals and microbes. This review explores the biosynthesis of melatonin in plants, with a particular focus on its diverse roles in Arabidopsis thaliana , a model species. Melatonin affects abiotic and biotic stress resistance in A. thaliana . Exogenous and endogenous melatonin is addressed in association with various conditions, including cold stress, high light stress, intense heat and infection with Botrytis cinerea or Pseudomonas , as well as in seed germination and lateral root formation. Furthermore, melatonin confers stress resistance in Arabidopsis by initiating the antioxidant system, remedying photosynthesis suppression, regulating transcription factors involved with stress resistance (CBF, DREB, ZAT, CAMTA, WRKY33, MYC2, TGA) and other stress-related hormones (abscisic acid, auxin, ethylene, jasmonic acid and salicylic acid). This article additionally addresses other precursors, metabolic components, expression of genes (COR , CBF , SNAT , ASMT , PIN , PR1 , PDF1.2 and HSFA ) and proteins (JAZ, NPR1) associated with melatonin and reducing both biological and environmental stressors. Furthermore, the future perspective of melatonin rich agri-crops is explored to enhance plant tolerance to abiotic and biotic stresses, maximise crop productivity and enhance nutritional worth, which may help improve food security.
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Affiliation(s)
- Muaz Ameen
- Department of Botany, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Asma Zafar
- Department of Botany, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Athar Mahmood
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Muhammad Anjum Zia
- Department of Biochemistry, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Kashif Kamran
- Department of Physics, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan
| | - Muhammad Mansoor Javaid
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
| | - Muhammad Yasin
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
| | - Bilal Ahmad Khan
- Department of Agronomy, College of Agriculture, University of Sargodha, Sargodha 40100, Pakistan
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Cano A, Hernández-Ruiz J, Arnao MB. Common Methods of Extraction and Determination of Phytomelatonin in Plants. Methods Mol Biol 2024; 2798:161-181. [PMID: 38587742 DOI: 10.1007/978-1-0716-3826-2_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
The presence of melatonin in plants, called phytomelatonin, has gained great interest in recent years. The determination of phytomelatonin levels in plant extracts for both physiological and plant foodstuff studies requires sophisticated techniques due to the low endogenous levels of this indolic compound with hormonal nature. This chapter presents the most common and advanced techniques in the determination of phytomelatonin, with special emphasis on the techniques of extraction, cleaning, separation, detection, identification, and quantification. Multiple examples and recommendations are presented for a clear overview of the pros and cons of phytomelatonin determinations in plant tissues, seeds, and fruits, mainly.
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Affiliation(s)
- Antonio Cano
- Phytohormones and Plant Development Laboratory, Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia, Murcia, Spain
| | - Josefa Hernández-Ruiz
- Phytohormones and Plant Development Laboratory, Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia, Murcia, Spain
| | - Marino B Arnao
- Phytohormones and Plant Development Laboratory, Department of Plant Biology (Plant Physiology), Faculty of Biology, University of Murcia, Murcia, Spain.
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Ayyanath MM, Shukla MR, Saxena PK. Indoleamines Impart Abiotic Stress Tolerance and Improve Reproductive Traits in Hazelnuts. PLANTS (BASEL, SWITZERLAND) 2023; 12:1233. [PMID: 36986922 PMCID: PMC10056574 DOI: 10.3390/plants12061233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 03/03/2023] [Accepted: 03/05/2023] [Indexed: 06/18/2023]
Abstract
Hazelnuts have recently gathered tremendous attention due to the expansion of the confectionary industry. However, the sourced cultivars fail to perform in initial phase of cultivation as they enter bare survival mode due to changes in climatic zones, for example, Southern Ontario, where the climate is continental, as opposed to the milder climate in Europe and Turkey. Indoleamines have been shown to counter abiotic stress and modulate vegetative and reproductive development of plants. Here, we examined the effect of indoleamines on the flowering response of the dormant stem cuttings of sourced hazelnut cultivars in controlled environment chambers. The stem cuttings were exposed to sudden summer-like conditions (abiotic stress) and the female flower development was assessed in relation to endogenous indoleamine titers. The sourced cultivars responded well to serotonin treatment by producing more flowers compared to the controls or other treatments. The probability of buds resulting in female flowers was highest in the middle region of the stem cuttings. It is interesting to note that the tryptamine titers of the locally adapted, and N-acetyl serotonin titers of native hazelnut cultivars, provided the best explanation for adaptation to the stress environment. Titers of both compounds were compromised in the sourced cultivars which resorted mostly to serotonin concentrations to counter the stress. The indoleamines tool kit identified in this study could be deployed in assessing cultivars for stress adaptation attributes.
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Zhang XY, Zhang Y, Zhou Y, Liu ZF, Wei BB, Feng XS. Melatonin in different food samples: Recent update on distribution, bioactivities, pretreatment and analysis techniques. Food Res Int 2023; 163:112272. [PMID: 36596183 DOI: 10.1016/j.foodres.2022.112272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 11/25/2022] [Accepted: 11/27/2022] [Indexed: 12/02/2022]
Abstract
Melatonin (MLT) plays a significant role on maintaining the basic physiological functions and regulating various metabolic processes in plentiful organisms. Recent years have witnessed an increase in MLT's share in global market with its affluent functions. However, the worrisome quality issues and inappropriate or excessive application of MLT take place inevitably. In addition, its photosensitive properties, oxidation, complex substrate concentration and trace levels leave exact detection of MLT doubly difficult. Therefore, it is essential to exploit precise, sensitive and stable extraction and detection methods to resolve above questions. In this study, we reviewed the distribution and bioactivities of MLT and conducted a comprehensive overview of the developments of pretreatment and analysis methods for MLT in food samples since 2010. Commonly used pretreatment methods for MLT include not only traditional techniques, but also novel ones, such as solid-phase extraction, QuEChERS, microextraction by packed sorbent, solid phase microextraction, liquid phase microextraction, and so on. Analysis methods include liquid chromatography coupled with different detectors, GC methods, capillary electrophoresis, sensors, and so on. The advantages and disadvantages of different techniques have been compared and the development tendency was prospected.
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Affiliation(s)
- Xin-Yue Zhang
- School of Pharmacy, China Medical University, Shenyang 110122, China; Department of Clinical Pharmacy & Pharmacy Administration, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Yuan Zhang
- School of Pharmacy, China Medical University, Shenyang 110122, China
| | - Yu Zhou
- Department of Pharmacy, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021 China
| | - Zhi-Fei Liu
- School of Pharmacy, China Medical University, Shenyang 110122, China
| | - Bin-Bin Wei
- School of Pharmacy, China Medical University, Shenyang 110122, China.
| | - Xue-Song Feng
- School of Pharmacy, China Medical University, Shenyang 110122, China.
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Erland LAE, Dumigan CR, Forsyth JA, Frolova L, Yasunaga AB, Pun W, Li ITS, Deyholos MK, Murch SJ. Mammalian Melatonin Agonist Pharmaceuticals Stimulate Rhomboid Proteins in Plants. Biomolecules 2022; 12:biom12070882. [PMID: 35883439 PMCID: PMC9313243 DOI: 10.3390/biom12070882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 12/04/2022] Open
Abstract
Melatonin is a human neurotransmitter and plant signalling metabolite that perceives and directs plant metabolism. The mechanisms of melatonin action in plants remain undefined. We hypothesized that roots have a melatonin-specific receptor and/or transporter that can respond to melatonin-mediating pharmaceuticals. To test this hypothesis Arabidopsis seedlings were grown with melatonin pharmaceutical receptor agonists: ramelteon and tasimelteon, and/or antagonists: luzindole and 4-P-PDOT. Ramelteon was found both to mimic and competitively inhibit melatonin metabolism in plants. Due to the higher selectivity of ramelteon for the MT1 receptor type in humans, a sequence homology search for MT1 in Arabidopsis identified the rhomboid-like protein 7 (RBL7). In physiological studies, Arabidopsis rbl7 mutants were less responsive to ramelteon and melatonin. Quantum dot visualizations of the effects of ramelteon on melatonin binding to root cell membranes revealed a potential mechanism. We propose that RBL7 is a melatonin-interacting protein that directs root architecture and growth in a mechanism that is responsive to environmental factors.
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Affiliation(s)
- Lauren A. E. Erland
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
- Department of Agriculture, University of the Fraser Valley, Chilliwack, BC V6T 1Z4, Canada
| | - Christopher R. Dumigan
- Department of Biology, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (C.R.D.); (M.K.D.)
| | - Jillian A. Forsyth
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Liubov Frolova
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Adam B. Yasunaga
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Winnie Pun
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Isaac T. S. Li
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
| | - Michael K. Deyholos
- Department of Biology, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (C.R.D.); (M.K.D.)
| | - Susan J. Murch
- Department of Chemistry, University of British Columbia, Kelowna, BC V1V 1V7, Canada; (L.A.E.E.); (J.A.F.); (L.F.); (A.B.Y.); (W.P.); (I.T.S.L.)
- Correspondence:
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Okeke ES, Ogugofor MO, Nkwoemeka NE, Nweze EJ, Okoye CO. Phytomelatonin: a potential phytotherapeutic intervention on COVID-19-exposed individuals. Microbes Infect 2022; 24:104886. [PMID: 34534695 PMCID: PMC8440003 DOI: 10.1016/j.micinf.2021.104886] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 09/03/2021] [Accepted: 09/03/2021] [Indexed: 12/23/2022]
Abstract
Phytomelatonin is a pleiotropic molecule that originated in higher plants with many diverse actions and is primarily an antioxidant. The recent identification and advancement of phytomelatonin unraveled the potential of this modulatory molecule being considered a new plant hormone, suggesting its relevance in treating respiratory infections, including COVID-19. Besides, this molecule is also involved in multiple hormonal, physiological, and biological processes at different levels of cell organization and has been marked for its ability to cross the blood-brain barrier and prominent antioxidant effects, reducing mitochondrial electron leakage, up-regulating antioxidant enzymes, acting as a free radical scavenger, and interfering with pro-inflammatory signaling pathways as seen in mood swings, body temperature, sleep, cancer, cardiac rhythms, and immunological regulation modulators. However, due to its diversity, availability, affordability, convenience, and high safety profile, phytomelatonin has also been suggested as a natural adjuvant. This review discussed the origin, content in various plant species, processes of extraction, and detection and therapeutic potentials of phytomelatonin in treating COVID-19-exposed individuals.
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Affiliation(s)
- Emmanuel Sunday Okeke
- Department of Biochemistry, University of Nigeria, Nsukka, 41000, Enugu State, Nigeria; Natural Science Unit, SGS, University of Nigeria, Nsukka, 41000, Enugu State, Nigeria; School of Environment and Safety Engineering, Jiangsu University, 212013, PR China; Organization of African Academic Doctors (OAAD), Off Kamiti Road, 25305000100, Nairobi, Kenya
| | - Martins Obinna Ogugofor
- Department of Biochemistry, University of Nigeria, Nsukka, 41000, Enugu State, Nigeria; Department of Chemical Sciences, Coal City University, Enugu, Enugu State, Nigeria
| | - Ndidi Ethel Nkwoemeka
- Natural Science Unit, SGS, University of Nigeria, Nsukka, 41000, Enugu State, Nigeria; Department of Microbiology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria
| | - Ekene John Nweze
- Department of Biochemistry, University of Nigeria, Nsukka, 41000, Enugu State, Nigeria
| | - Charles Obinwanne Okoye
- School of Environment and Safety Engineering, Jiangsu University, 212013, PR China; Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria; Biofuels Institute, Jiangsu University, Zhenjiang, 212013, PR China; Organization of African Academic Doctors (OAAD), Off Kamiti Road, 25305000100, Nairobi, Kenya.
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Sun C, Liu L, Wang L, Li B, Jin C, Lin X. Melatonin: A master regulator of plant development and stress responses. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2021; 63:126-145. [PMID: 32678945 DOI: 10.1111/jipb.12993] [Citation(s) in RCA: 143] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 07/16/2020] [Indexed: 05/18/2023]
Abstract
Melatonin is a pleiotropic molecule with multiple functions in plants. Since the discovery of melatonin in plants, numerous studies have provided insight into the biosynthesis, catabolism, and physiological and biochemical functions of this important molecule. Here, we describe the biosynthesis of melatonin from tryptophan, as well as its various degradation pathways in plants. The identification of a putative melatonin receptor in plants has led to the hypothesis that melatonin is a hormone involved in regulating plant growth, aerial organ development, root morphology, and the floral transition. The universal antioxidant activity of melatonin and its role in preserving chlorophyll might explain its anti-senescence capacity in aging leaves. An impressive amount of research has focused on the role of melatonin in modulating postharvest fruit ripening by regulating the expression of ethylene-related genes. Recent evidence also indicated that melatonin functions in the plant's response to biotic stress, cooperating with other phytohormones and well-known molecules such as reactive oxygen species and nitric oxide. Finally, great progress has been made towards understanding how melatonin alleviates the effects of various abiotic stresses, including salt, drought, extreme temperature, and heavy metal stress. Given its diverse roles, we propose that melatonin is a master regulator in plants.
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Affiliation(s)
- Chengliang Sun
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Lijuan Liu
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Luxuan Wang
- Department of Agriculture and Environment, McGill University, Montreal, Quebec, H9X 3V9, Canada
| | - Baohai Li
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Chongwei Jin
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xianyong Lin
- MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
- Key Laboratory of Subtropical Soil Science and Plant Nutrition of Zhejiang Province, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China
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The Morphoregulatory Role of Thidiazuron: Metabolomics-Guided Hypothesis Generation for Mechanisms of Activity. Biomolecules 2020; 10:biom10091253. [PMID: 32872300 PMCID: PMC7564436 DOI: 10.3390/biom10091253] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/06/2020] [Accepted: 08/22/2020] [Indexed: 11/20/2022] Open
Abstract
Thidiazuron (TDZ) is a diphenylurea synthetic herbicide and plant growth regulator used to defoliate cotton crops and to induce regeneration of recalcitrant species in plant tissue culture. In vitro cultures of African violet thin petiole sections are an ideal model system for studies of TDZ-induced morphogenesis. TDZ induces de novo shoot organogenesis at low concentrations and somatic embryogenesis at higher concentrations of exposure. We used an untargeted metabolomics approach to identify metabolites in control and TDZ-treated tissues. Statistical analysis including metabolite clustering, pattern and pathway tools, logical algorithms, synthetic biotransformations and hormonomics identified TDZ-induced changes in metabolism. A total of 18,602 putative metabolites with extracted masses and predicted formulae were identified with 1412 features that were found only in TDZ-treated tissues and 312 that increased in response to TDZ. The monomer of TDZ was not detected intact in the tissues but putative oligomers were found in the database and we hypothesize that these may form by a Diels–Alder reaction. Accumulation oligomers in the tissue may act as a reservoir, slowly releasing the active TDZ monomer over time. Cleavage of the amide bridge released TDZ-metabolites into the tissues including organic nitrogen and sulfur containing compounds. Metabolomics data analysis generated six novel hypotheses that can be summarized as an overall increase in uptake of sugars from the culture media, increase in primary metabolism, redirection of terpene metabolism and mediation of stress metabolism via indoleamine and phenylpropanoid metabolism. Further research into the specific mechanisms hypothesized is likely to unravel the mode of action of TDZ and to provide new insights into the control of plant morphogenesis.
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Kulus D, Tymoszuk A. Induction of Callogenesis, Organogenesis, and Embryogenesis in Non-Meristematic Explants of Bleeding Heart and Evaluation of Chemical Diversity of Key Metabolites from Callus. Int J Mol Sci 2020; 21:ijms21165826. [PMID: 32823732 PMCID: PMC7461564 DOI: 10.3390/ijms21165826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 12/16/2022] Open
Abstract
Lamprocapnos spectabilis (L.) Fukuhara is a perennial plant species valued in the horticultural, cosmetic, and pharmaceutical markets. To date, however, there were no studies on tissue culture systems in this species when adjusted from non-meristematic explants. The aim of this study is to induce callogenesis, organogenesis, and somatic embryogenesis in non-meristematic explants of Lamprocapnos spectabilis 'Alba' cultured in various media and to analyze the chemical diversity of the produced callus. Leaf, petiole, and internode explants were cultured on the modified Murashige and Skoog (MS) medium fortified with various combinations and concentrations of 6-benzyladenine (BA), indole-3-acetic acid (IAA), 1-naphthaleneacetic acid (NAA), 2,4-dichlorphenoxyacetic acid (2,4-D), and picloram (PIC). After 10 weeks of culturing, the morphogenetic response of explants was evaluated and the concentration of chlorophylls, carotenoids, anthocyanins, and polyphenols in callus was analyzed. There was no influence of explant type on the callogenesis efficiency (62.1-65.3%). The highest fresh weight of callus was produced on leaf explants in the presence of 2,4-D or PIC. In contrast, the highest share of dry weight was found in internode-derived calli and cultured on IAA-supplemented medium (up to 30.8%). Only 2.5% of all explants regenerated adventitious shoots, while rhizogenesis was reported in 4.5% of explants. Somatic embryos were produced indirectly by 0% to 100% of explants, depending on the culture medium and explant type. The highest mean number of embryos (11.4 per explant) was found on petioles cultured in the MS medium with 0.5 mg·L-1 BA and 1.0 mg·L-1 PIC. Calli cultured in media with NAA usually contained a higher content of primary and secondary metabolites. There was also a significant impact of explant type on the content of anthocyanins, polyphenols, and carotenoids in callus. Further studies should focus on the elicitation of metabolites production in callus culture systems of the bleeding heart.
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Pranil T, Moongngarm A, Loypimai P. Influence of pH, temperature, and light on the stability of melatonin in aqueous solutions and fruit juices. Heliyon 2020; 6:e03648. [PMID: 32258489 PMCID: PMC7109460 DOI: 10.1016/j.heliyon.2020.e03648] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 12/24/2019] [Accepted: 03/19/2020] [Indexed: 12/21/2022] Open
Abstract
The ability to predict melatonin stability during food processing or storage is important. Therefore, the degradation of melatonin in both aqueous solutions and fruit juice samples was investigated. The pH values of aqueous solutions were set over a pH range from 1 to 13 and at four different temperatures (60, 70, 80 and 90 °C). The highest remaining melatonin (CR) was observed in the lowest pH solution (pH = 1, CR > 65%). Melatonin concentrations decreased with rising pH levels from pH 4 to 13 during storage time. The thermal degradation rate constant of melatonin (k) values obtained followed the order: k90°C (0.175) >k80°C (0.123) >k70°C (0.082) >k60°C (0.027). Thermal degradation kinetics followed the first-order reaction model with a high range of coefficients of determination (0.9744 < R2 < 0.995). The temperature also affected on melatonin degradation in fruit juices which the degradation rate was increased with the presence of light and high temperature. Our results can be used as guidelines to develop a processing method that predicts melatonin degradation during thermal processing of food products.
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Affiliation(s)
- Thorung Pranil
- Research Unit of Nutrition for Life, Department of Food Technology and Nutrition, Faculty of Technology, Mahasarakham University, Maha Sarakham, 44150, Thailand
| | - Anuchita Moongngarm
- Research Unit of Nutrition for Life, Department of Food Technology and Nutrition, Faculty of Technology, Mahasarakham University, Maha Sarakham, 44150, Thailand
| | - Patiwit Loypimai
- Division of Food Science and Technology, Faculty of Science and Technology, Bansomdejchapraya Rajabhat University, Bangkok, 10600, Thailand
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Erland LAE, Saxena P. Auxin driven indoleamine biosynthesis and the role of tryptophan as an inductive signal in Hypericum perforatum (L.). PLoS One 2019; 14:e0223878. [PMID: 31622392 PMCID: PMC6797091 DOI: 10.1371/journal.pone.0223878] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 10/01/2019] [Indexed: 11/19/2022] Open
Abstract
In the 60 years since Skoog and Miller first reported the chemical redirection of plant growth the underlying biochemical mechanisms are still poorly understood, with one challenge being the capacity for applied growth regulators to act indirectly or be metabolized to active phytohormones. We hypothesized that tryptophan is metabolized to auxin, melatonin or serotonin inducing organogenesis in St. John's wort (Hypericum perforatum L.). Root explants from two germplasm lines of St. John's wort with altered melatonin metabolism and wildtype were incubated with auxin or tryptophan for 24, 48 or 72 h to induce regeneration. In wildtype, tryptophan had little effect on the indoleamine pathway, and was found to promote primary growth, suggesting excess tryptophan moved quickly through various secondary metabolite pathways and protein synthesis. In lines 4 and 112 tryptophan was associated with modified morphogenesis, indoleamine and auxin levels. Incubation with tryptophan increased shoot organogenesis while incubation with auxin led to root regeneration. The established paradigm of thought views tryptophan primarily as a precursor for auxin and indoleamines, among other metabolites, and mediation of auxin action by the indoleamines as a one-way interaction. We propose that these processes run in both directions with auxin modifying indoleamine biosynthesis and the melatonin:serotonin balance contributing to its effects on plant morphogenesis, and that tryptophan also functions as an inductive signal to mediate diverse phytochemical and morphogenetic pathways.
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Affiliation(s)
- Lauren A. E. Erland
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, Ontario, Canada
| | - Praveen Saxena
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, Ontario, Canada
- * E-mail:
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Panda SS, Bera RKVV, Pradhan SS. Development and validation of a quality by design enabled robust LC method for estimation of daptomycin in pharmaceutical dosage form. SEPARATION SCIENCE PLUS 2019. [DOI: 10.1002/sscp.201900062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Sagar Suman Panda
- Department of Pharmaceutical Analysis & Quality AssuranceRoland Institute of Pharmaceutical Sciences (Affiliated to Biju Patnaik University of Technology, Odisha) Berhampur Odisha India
| | - Ravi Kumar Venkata Varaha Bera
- Department of Pharmaceutical Analysis & Quality AssuranceRoland Institute of Pharmaceutical Sciences (Affiliated to Biju Patnaik University of Technology, Odisha) Berhampur Odisha India
| | - Swati Swagatika Pradhan
- Department of Pharmaceutical Analysis & Quality AssuranceRoland Institute of Pharmaceutical Sciences (Affiliated to Biju Patnaik University of Technology, Odisha) Berhampur Odisha India
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Lee K, Back K. Melatonin-deficient rice plants show a common semidwarf phenotype either dependent or independent of brassinosteroid biosynthesis. J Pineal Res 2019; 66:e12537. [PMID: 30403303 DOI: 10.1111/jpi.12537] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 10/11/2018] [Accepted: 10/26/2018] [Indexed: 12/13/2022]
Abstract
Melatonin-deficient rice with a semidwarf erect-leaf phenotype was created by suppressing serotonin N-acetyltransferase 2 (SNAT2). We generated an RNAi transgenic rice that suppressed tryptophan decarboxylase (TDC), which encodes the first TDC enzyme committed step for melatonin biosynthesis in plants catalyzing the conversion of tryptophan into tryptamine, to determine whether other transgenic rice with downregulated melatonin biosynthetic genes exhibited the same erect-leaf phenotype as the snat2 RNAi rice. The TDC RNAi rice produced significantly less melatonin than the wild type and exhibited a semidwarf phenotype, but no erect-leaf phenotype was observed. In contrast, tryptamine 5-hydroxylase (T5H) knockout Sekiguchi rice and caffeic acid O-methyltransferase (COMT) RNAi rice seedlings were semidwarf phenotypes with erect leaves, as was the snat2 RNAi rice due to a melatonin deficiency. All RNAi rice plants showing erect-leaf phenotypes had lower expression levels of the DWARF4 gene, which is a key enzyme for brassinosteroid (BR) biosynthesis, leading to lower BR levels than their respective wild types. Suppressing melatonin synthesis did not alter the contents of indole 3-acetic acid (IAA), suggesting the irrelevance of melatonin deficiency to IAA biosynthesis. These data indicate that a semidwarf seedling is a common rice phenotype by the lack of melatonin synthesis with or without BR suppression in a melatonin biosynthetic gene-specific manner.
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Affiliation(s)
- Kyungjin Lee
- Department of Biotechnology, Bioenergy Research Center, Chonnam National University, Gwangju, South Korea
| | - Kyoungwhan Back
- Department of Biotechnology, Bioenergy Research Center, Chonnam National University, Gwangju, South Korea
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Abstract
Domestic and international travel represents a regular challenge to high-performance track-and-field athletes, particularly when associated with the pressure of competition or the need to support specialized training (e.g., altitude or heat adaptation). Jet lag is a challenge for transmeridian travelers, while fatigue and alterations to gastrointestinal comfort are associated with many types of long-haul travel. Planning food and fluid intake that is appropriate to the travel itinerary may help to reduce problems. Resynchronization of the body clock is achieved principally through manipulation of zeitgebers, such as light exposure; more investigation of the effects of melatonin, caffeine, and the timing/composition of meals will allow clearer guidelines for their contribution to be prepared. At the destination, the athlete, the team management, and catering providers each play a role in achieving eating practices that support optimal performance and success in achieving the goals of the trip. Although the athlete is ultimately responsible for his or her nutrition plan, best practice by all parties will include pretrip consideration of risks around the quality, quantity, availability, and hygiene standards of the local food supply and the organization of strategies to deal with general travel nutrition challenges as well as issues that are specific to the area or the special needs of the group. Management of buffet-style eating, destination-appropriate protocols around food/water and personal hygiene, and arrangement of special food needs including access to appropriate nutritional support between the traditional "3 meals a day" schedule should be part of the checklist.
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Lee K, Hwang OJ, Reiter RJ, Back K. Flavonoids inhibit both rice and sheep serotonin N-acetyltransferases and reduce melatonin levels in plants. J Pineal Res 2018; 65:e12512. [PMID: 29851162 DOI: 10.1111/jpi.12512] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 05/25/2018] [Indexed: 12/29/2022]
Abstract
The plant melatonin biosynthetic pathway has been well characterized, but inhibitors of melatonin synthesis have not been well studied. Here, we found that flavonoids potently inhibited plant melatonin synthesis. For example, flavonoids including morin and myricetin significantly inhibited purified, recombinant sheep serotonin N-acetyltransferase (SNAT). Flavonoids also dose-dependently and potently inhibited purified rice SNAT1 and SNAT2. Thus, myricetin (100 μmol/L) reduced rice SNAT1 and SNAT2 activity 7- and 10-fold, respectively, and also strongly inhibited the N-acetylserotonin methyltransferase activity of purified, recombinant rice caffeic acid O-methyltransferase. To explore the in vivo effects, rice leaves were treated with flavonoids and then cadmium. Flavonoid-treated leaves had lower melatonin levels than the untreated control. To explore the direct roles of flavonoids in melatonin biosynthesis, we first functionally characterized a putative rice flavonol synthase (FLS) in vitro and generated flavonoid-rich transgenic rice plants that overexpressed FLS. Such plants produced more flavonoids but less melatonin than the wild-type, which suggests that flavonoids indeed inhibit plant melatonin biosynthesis.
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Affiliation(s)
- Kyungjin Lee
- Department of Biotechnology, Bioenergy Research Center, Chonnam National University, Gwangju, Korea
| | - Ok Jin Hwang
- Department of Biotechnology, Bioenergy Research Center, Chonnam National University, Gwangju, Korea
| | - Russel J Reiter
- Department of Cellular and Structural Biology, The Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Kyoungwhan Back
- Department of Biotechnology, Bioenergy Research Center, Chonnam National University, Gwangju, Korea
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Arnao MB, Hernández-Ruiz J. Phytomelatonin, natural melatonin from plants as a novel dietary supplement: Sources, activities and world market. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.06.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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17
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Hong Y, Zhang Y, Sinumporn S, Yu N, Zhan X, Shen X, Chen D, Yu P, Wu W, Liu Q, Cao Z, Zhao C, Cheng S, Cao L. Premature leaf senescence 3, encoding a methyltransferase, is required for melatonin biosynthesis in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 95:877-891. [PMID: 29901843 DOI: 10.1111/tpj.13995] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 05/28/2018] [Accepted: 06/04/2018] [Indexed: 05/24/2023]
Abstract
Premature leaf senescence in rice is one of the most common factors affecting the plant's development and yield. Although methyltransferases are involved in diverse biological functions, their roles in rice leaf senescence have not been previously reported. In this study, we identified the premature leaf senescence 3 (pls3) mutant in rice, which led to early leaf senescence and early heading date. Further investigations revealed that premature leaf senescence was triggered by the accumulation of reactive oxygen species. Using physiological analysis, we found that chlorophyll content was reduced in the pls3 mutant leaves, while hydrogen peroxide (H2 O2 ) and malondialdehyde levels were elevated. Consistent with these findings, the pls3 mutant exhibited hypersensitivity to exogenous hydrogen peroxide. The expression of other senescence-associated genes such as Osh36 and RCCR1 was increased in the pls3 mutant. Positional cloning indicated the pls3 phenotype was the result of a mutation in OsMTS1, which encodes an O-methyltransferase in the melatonin biosynthetic pathway. Functional complementation of OsMTS1 in pls3 completely restored the wild-type phenotype. We found leaf melatonin content to be dramatically reduced in pls3, and that exogenous application of melatonin recovered the pls3 mutant's leaf senescence phenotype to levels comparable to that of wild-type rice. Moreover, overexpression of OsMTS1 in the wild-type plant increased the grain yield by 15.9%. Our results demonstrate that disruption of OsMTS1, which codes for a methyltransferase, can trigger leaf senescence as a result of decreased melatonin production.
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Affiliation(s)
- Yongbo Hong
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Yingxin Zhang
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Sittipun Sinumporn
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Ning Yu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Xiaodeng Zhan
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Xihong Shen
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Daibo Chen
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Ping Yu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Weixun Wu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Qunen Liu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Zhaoyun Cao
- Rice Product Quality Supervision and Inspection Centre, Ministry of Agriculture and Rural Affairs, China National Rice Research Institute, Hangzhou, 310006, China
| | - Chunde Zhao
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Shihua Cheng
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
| | - Liyong Cao
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
- Zhejiang Key Laboratory of Super Rice Research, China National Rice Research Institute, Hangzhou, 310006, China
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18
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Erland LAE, Shukla MR, Singh AS, Murch SJ, Saxena PK. Melatonin and serotonin: Mediators in the symphony of plant morphogenesis. J Pineal Res 2018; 64. [PMID: 29149453 DOI: 10.1111/jpi.12452] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 10/16/2017] [Indexed: 12/30/2022]
Abstract
Melatonin and serotonin are important signaling and stress mitigating molecules that play important roles across growth and development in plants. Despite many well-documented responses, a systematic investigation of the entire metabolic pathway (tryptophan, tryptamine, and N-acetylserotonin) does not exist, leaving many open questions. The objective of this study was to determine the responses of Hypericum perforatum (L.) to melatonin, serotonin, and their metabolic precursors. Two well-characterized germplasm lines (#4 and 112) created by mutation and a haploid breeding program were compared to wild type to identify specific responses. Germplasm line 4 has lower regenerative and photosynthetic capacity than either wild type or line 112, and there are documented significant differences in the chemistry and physiology of lines 4 and 112. Supplementation of the culture media with tryptophan, tryptamine, N-acetylserotonin, serotonin, or melatonin partially reversed the regenerative recalcitrance and growth impairment of the germplasm lines. Quantification of phytohormones revealed crosstalk between the indoleamines and related phytohormones including cytokinin, salicylic acid, and abscisic acid. We hypothesize that melatonin and serotonin function in coordination with their metabolites in a cascade of phytochemical responses including multiple pathways and phytohormone networks to direct morphogenesis and protect photosynthesis in H. perforatum.
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Affiliation(s)
- Lauren A E Erland
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, ON, Canada
| | - Mukund R Shukla
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, ON, Canada
| | - Amritpal S Singh
- Summerland Research and Development Centre, Agriculture and Agri-Food Canada, Summerland, BC, Canada
| | - Susan J Murch
- Department of Chemistry, University of British Columbia, Kelowna, BC, Canada
| | - Praveen K Saxena
- Department of Plant Agriculture, Gosling Research Institute for Plant Preservation, University of Guelph, Guelph, ON, Canada
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